04-11-2011, 23:07
Hi shortcake,
Once I started looking for it, I found literature about all common phyto-estrogens disturbing cycles: PM, hops, soy, flax, you name it. But you are right to think it's the progesterone, on BO. In a natural cycle, progesterone is really zero from day 25 to day 11. Some write the decrease in progesterone on day 25 triggers the period.
The pituitary didn't help. It also increases LH and FSH. While it's normal for these hormones to increase a little at the start of a period, the real peaks occur during ovulation. If the uterus wall gets hormone levels typical of a period one day, and hormone levels typical of an ovulation the next, it will answer with a stop and go period. It just follows orders.
Once I started looking for it, I found literature about all common phyto-estrogens disturbing cycles: PM, hops, soy, flax, you name it. But you are right to think it's the progesterone, on BO. In a natural cycle, progesterone is really zero from day 25 to day 11. Some write the decrease in progesterone on day 25 triggers the period.
The pituitary didn't help. It also increases LH and FSH. While it's normal for these hormones to increase a little at the start of a period, the real peaks occur during ovulation. If the uterus wall gets hormone levels typical of a period one day, and hormone levels typical of an ovulation the next, it will answer with a stop and go period. It just follows orders.